Packing device



Dec. 3, 1940. H. HORNSCHUCH 2,223,519

PACKING DEVICE Filed May 13, 1939 HIS ATTORNEY:

Patented Dec. 3, 1940 sTA'ras FAQ) 1' DEVICE Application May 13, 1939, Serial No. 273,419

' 1 Claim.

This invention relates to packing devices, and more particularly to packing devices for pumps handling fluid of high temperature.

One object of the invention is to prevent the exposure of the packing material to the heat of the fluid being pumped.

Another object is to assure the continued pliancy of packing of the compressible type throughout a long period of service.

to Gther objects will be in part obvious and in part pointed out hereinafter.

In the drawing accompanying this specification and in which similar reference numerals refer to similar parts,

iii Figure l is a longitudinal elevation, partly in section, of a packing device constructed in accordance with the practice of the invention and the stuffing box of a pump to which the packing device is applied,

so Figure 2 is a transverse view taken on the line 2-2 of Figure 1,

Figure 3 is a view similar to Figure 1 showing a modified form of the invention, and

Figure 4 is a longitudinal side view of a detil tail.

Referring more particularly to the drawing and at first to the form of the invention illustrated in Figures 1 and 2, 20 designates a portion of a pump casing having a pumping chamber 29 59 and a stuffing box '22 adjacent the pump chamber.

A shaft 23 extends through the stuiling box and the pump chamber and carries an impeller 24 which is held in position on the shaft by a 35 pair of sleeves to and 26. The latter sleeve extends through the stufling box and is pressed against the impeller 24 by a nut 21 threaded on the shaft 23. v

The sleeve to serves as a renewable wearing to surface for the shaft in the plane of the stuffing box 22 and, in accordance with the practice of the invention, the stulling box is provided with a bore 26 of considerably larger diameter than the sleeve to receive a container 29 which may 45 be secured to the stufilng box in any suitable manner, as for example by welding material til. The bore in the stumng box is of two diameters comprising-a reduced portion 3i adjacent the inner .end of the sleeve %,-which it encircles, and

m an enlargedportlon' 82 to receive packing rings 33 of the compressible type The bore 32 extends from the bore 3i to the outermost end of the container 29 and intermediate the ends of the group of packing rings is a lantern gland 3d having channels 35 for the passage of fluid serving to effect a seal around the sleeve 23. A gland 36 extends into the outer end of the bore 32 for compressing the packing" rings 38 and is actuated by bolts 31 extending through the gland 36 and threaded into the 5 stufing box 22. The wall 88 oi the container 29 adjacent the sleeve 26 and the packing rings 33 is preferably relatively thin to assure a rapid transmission of heat, and on the outer surface of the wall 33 are annular ribs 39 which seat with their peripheries lii against the surface of the bore 28 in the stumps box. The ribs till are spaced suitable distances apart to define channels at therebetween for cooling medium and are continned cool the inner end of the bore 32 and so arranged that portions of the innermost channels li lie in the longitudinal plane of the enlaraed bore 32 in order to maintain a body of cooling li uld'between the inner end of the packw ing and the source of heat. In the outer zones of the ribs are ports 62 to afford communication between adjacent channels ill.

The ports 32 in adjacent ribs are preferably staggered with respect to each other, that is, the 85 port d2 of one rib lies on one side of the axis of the container and the port 62 in the adjacent rib lies on the opposite side. Owing to this arrangement the cooling medium flowing through the channels ti will follow a serpentine path around the sleeve 28 and the packing rings 33 to assure the intimate contact of cooling medium with the periphery of the container 29 and also with the ribs carried by the container.

As a preferred arrangement the cooling me- 85 dium, as for example water, is first introduced into the innermost channel ti by a supply conduit 38 which opens into a channel M in the stumng box leading to said innermost channel til. An outlet is provided for the cooling medi- 40 um by a conduit to attached to the stufiing box and communicating with the outermost channel li through a port dd.

The cooling medium circulated through the channels it also serves to fill the channels 35 in 4,5 the lantern gland and the wall 338 is accordingly provided with ports ti to afford communication between the channels 35 and the immediately adjacent channel iii.

In the iorm of the invention illustrated in Figures 3 and l the container, designated id, is provided on its outer surface with a spiral rib it that extends from the outer end of the container to a point beyond the inner end of the bore 32. The rib d9 seats with its periphery 43 around the shaft 23 and the packing rings 33 to the discharge conduit 85. Portions of themner'most spirals, and thus of the channel 50, in

this instance also lie in the longitudinal plane of the bore 32 in order to minimize the flow of heat to the inner end of the packing. The container is also provided with ports 4? to convey liquid from the spiral channel 50 into the channels 36 in the lantern gland M.

In practice, the present invention has been found to be highly efiective for use in connection with compressible packing in stumng boxes of pumps handling hot liquids. By circulating cooling medium through the stufllng box in the manner described the temperature in the vicinity of the packing material may be maintained at a sufliciently moderate degree to assure the initial pliancy of the packing through a greatly extended period of service. The packing will, therefore, be prevented from early assuming a set form and from becoming baked to a degree v of hardness that will mar the surface not the rotary element which it is intended to seal.

I claim: v

A- packing device for a rod, comprising a stuffing box surrounding the rod, a container in the on the opposite sides of the container, and packing in the container for the rod.

HAN'Ns HORNSCH UCH. 

